| Trendy Abode Limited | Wholesale & retail | 2026 |
| Trendy Bedding Limited | Wholesale & retail | 2019 |
| Trendyol PH Limited | Wholesale & retail | 2025 |
| Trenklos Limited | Information & communication | 2019 |
| Trentino Services Ltd | Transport & logistics | 2022 |
| Trentmore Limited | Real estate | 2017 |
| Trentside Consulting Limited | Professional & scientific | 2005 |
| Trentside Property Investments Ltd | Real estate | 2016 |
| Treppas Cars Limited | Wholesale & retail | 2018 |
| Treppas Properties Limited | Real estate | 2019 |
| Trevalyan Consulting Limited | Professional & scientific | 2023 |
| Trevia Reel Limited | Information & communication | 2025 |
| TRG (33M) Ltd | Real estate | 2024 |
| Tri-Athon (Global) Limited | Extraterritorial | 2014 |
| Tri-Heritage Projects Ltd | Real estate | 2025 |
| Tri-Ko Construction Ltd | Construction | 2021 |
| Triangle Attractions Ltd | Arts & recreation | 2021 |
| Triaxisx Limited | Wholesale & retail | 2024 |
| Tribe Automotive Funding Ltd | Wholesale & retail | 2022 |
| Tribez Steakhouse Ltd | Hospitality | 2023 |
| Tribro Property Group Ltd | Real estate | 2026 |
| Trickett Transport Limited | Transport & logistics | 2025 |
| Trickys Gym Limited | Arts & recreation | 2014 |
| Trident Body Repair Centre Limited | Wholesale & retail | 2011 |
| Trident Chimney Sweep Ltd | Administrative & support | 2025 |
| Trifecta Commercial Services Ltd | Professional & scientific | 2025 |
| Trifles Bakery Limited | | 2010 |
| Trigger Happy UK Ltd | Arts & recreation | 2018 |
| Trikes UK Ltd | Wholesale & retail | 2014 |
| Trileaf Ltd | Wholesale & retail | 2022 |
| Trilogy Beverage Brands Ltd | Wholesale & retail | 2013 |
| Trilogy Care Services Ltd | Health & social care | 2024 |
| Trilogy Motors Limited | Wholesale & retail | 2025 |
| Trim Street Apartments Limited | Construction | 2016 |
| Trimaxx Nutrition Limited | Wholesale & retail | 2025 |
| Trinitex Energy Infrastructure Group Limited | Financial services | 2023 |
| Trinity Koncepts Limited | Health & social care | 2013 |
| Trinity North Limited | Construction | 2015 |
| Trinity Packaging UK Ltd | Manufacturing | 2024 |
| Trinity Place Residents Limited | Households | 2007 |
| Trinity Works Limited | Construction | 2022 |
| Trinkets & Tales Ltd | Wholesale & retail | 2026 |
| Trinnacle Software Engineering Solutions Ltd | Information & communication | 2024 |
| Trio Cleaning and Hygiene Ltd | Administrative & support | 2026 |
| Trio Shop Ltd | Wholesale & retail | 2023 |
| Trio Time Limited | Hospitality | 2024 |
| Triple 3 Executive Travel Ltd | Transport & logistics | 2023 |
| Triple a Financials Ltd | Professional & scientific | 2020 |
| Triple Ace Cleaning Solutions Ltd | Administrative & support | 2025 |
| Triple B’S Philly Steaks & Burgers Ltd | Hospitality | 2023 |
| Triple D Haulage Limited | Transport & logistics | 2024 |
| Triple J Sports Limited | Administrative & support | 2003 |
| Triple PI Ltd | Real estate | 2025 |
| Triple Zero Taxis Limited | Transport & logistics | 2013 |
| TRIPLE6IX Engineering Ltd | Professional & scientific | 2020 |
| Tripleaomooba Ltd | Wholesale & retail | 2024 |
| Tripping Yarns Ltd | Professional & scientific | 2022 |
| Tripplea Store Ltd | Hospitality | 2024 |
| Triresi Ltd | Real estate | 2024 |
| Trissy's Limited | Hospitality | 2022 |
| Tritech Ground Engineering Ltd. | Construction | 1989 |
| Tritech Piling and Foundations Limited | Construction | 1996 |
| Triumph Media Agency Ltd | Professional & scientific | 2023 |
| Triumph Solutionz Limited | Wholesale & retail | 2013 |
| Trixano Ltd | Wholesale & retail | 2026 |
| Trlg Systems Limited | Information & communication | 2018 |
| Trojan Farnworth Ltd | Hospitality | 2022 |
| Trojan Takeaway Limited | Hospitality | 2019 |
| Tropical Cafe Ltd | Hospitality | 2016 |
| Tropical Palms (UK) Limited | Other services | 2013 |
| Tropical Venue Limited | Hospitality | 2024 |
| Tropicana Spa Limited | Other services | 2018 |
| Trowler a W Limited | Wholesale & retail | 2018 |
| Troy Transport Services Limited | Transport & logistics | 2026 |
| TRS Europe Limited | Wholesale & retail | 2017 |
| TRS Holdings Limited | Professional & scientific | 2007 |
| TRU Properties Ltd | Real estate | 2021 |
| TRU Retail Solutions Limited | Wholesale & retail | 2014 |
| TRU3TA1ENT Limited | Information & communication | 2017 |
| Trubooks Limited | Professional & scientific | 2024 |
| Truck Services Bolton Lorry Park Limited | Professional & scientific | 2012 |
| Trucksense AI Ltd | Information & communication | 2025 |
| Truckstar Ltd | Wholesale & retail | 2009 |
| Trudie’S Care Limited | Health & social care | 2019 |
| Trudyc Properties Ltd | Real estate | 2020 |
| True Broking Ltd | Financial services | 2019 |
| True Change Solutions Ltd | Information & communication | 2025 |
| True Ground Acquisitions Limited | Real estate | 2026 |
| True Ground Developments Group Ltd | Financial services | 2026 |
| True Love Always Ltd | Arts & recreation | 2024 |
| True North School Ltd | Education | 2026 |
| True Pave UK Ltd | Water & waste | 2025 |
| True Performers Ltd | Information & communication | 2011 |
| True Roots Ventures Ltd | Administrative & support | 2026 |
| True Story Limited | Information & communication | 2021 |
| Trueline Group Limited | Wholesale & retail | 2025 |
| Truelink Civil Limited | Construction | 2010 |
| Truepath Ventures Ltd | Real estate | 2025 |
| Trulow LLP | | 2016 |
| Truly Tropical Limited | Wholesale & retail | 2025 |